Study On The Mechanical Properties Of Tailings Sand Reinforced By Geotextile

Based on the results of a great deal of scientific research and yield practice, the dissertation systematically summarize the experience and lessons from examples of sesimic disease accidents of tailings dam and its behavior in the running at home and abroad. By using the reinforced theory of composite material,geotextile is employed to improve the mechanical capability of tailings dam. The figure of different geometry, physics and loads which will influence the mechanical capability and the rule in the evolvement of composite material according to the idea of structure form control the law during the evolvement of tailings reservoir system are discussed. The corresponding intensity equation and failure criterion are set up also. By the means of shear strengthening experiment in door, this dissertation detailedly study and discuss the tension capacity of geotextile,the interfacial shear strength of the composite material, the deformation and strength of tailings sand under different strengthen density, the feasibility in the practice of reinforcement, so it with its effect. Using the numerical simulation technique, this paper calculate the mechanical behavior of the structre consist of geotextile and tailings sand. In the later, the reinforced soil theory which applied to tailings reservior engineering is simply presentationed, The leading content includes as:① Detailedly analysed the present study and existed problems in the application of some soil-reinforced technique with geotextile, so it with the mechnical characteristic of tailings sand.② The method and the contents in the study of mechanical characteristic used to the reinforced tailings sand by geotextile has been proposed.③ Point out the characteristic in size and safety of tailing dams at home, after the definition of the tailings reservoir system, some mechanical characteristic and its evolving variation of above system has been analysed. ④ In view of the distributing characteristic of tailings granule in plane and vertical plane, the influnce to the composite structure consit of geotextile and tailings sand born in the change of appearance geometry, the physics and the loading is analysed, based on the principle of composite material, this paper discuss the law of interfacial stress distributing in the course of interaction, based on the elastic theory, the mathematical equation of stress transfer under shear stress are deducted in the structure consist of the main and the intensifier, the corresponding intensity theory and criterion are set up from triaxial compession test, so it as the displacement change with the length of geotextile and the theoretic analysis on the reactive rule of some reinforced structure under appointed vibrational loads.⑤ Triaxial compression tests as complementary study methods are used to study the mechanism of reinforced tailing sands, the influence to the strength and the deformation under different constringent density and cycle loads. so it with the tension strength of getextile and geomembrane, the interfacial shear stress of geotextile and tailing sands.The study has shown that the geotextile is a all right material used as reinforcedment.⑥ Based on the rigid-plastic model,the equation of potential glide unit used to caculate the stability of tailing sands reinforced by geotextile was bring forward, the stability of reinfoced tailing dams under static loads and sesimic loads has been analysed and executed.The change law of safety coefficient under different kinds of geotextiles and the number of layer in the tailing dam are pointed out.⑦ Based on the mechanical model of elasticity and plasticity, finite elements method under static loads and dynamic loads are used to caculate the displacement fields and stress field of the reinforced tailing dam constructed by tailings sand, so it with the main influence factor as the elastical moudulus and the density of the tailings sand,the pre-strain of geotextile and the stiffness modulus of its subgrade which to the effect; in the later,the behavior of...